Electromagnetic switching device



March 19, 1935. K. SLAWIK 1,994,671

ELECTROMAGNETIC SWITCHING DEVICE Filed Nov. 14, 1953 FIG. FIG. 2

- INVENTOR By K. SLAM/[K ATTORNEY Patented Mar. 19, 1935 ELECTROMAGNETICSWITCHING DEVICE Kurt Siawik, Vienna, Austria, aasignor to WesternElectric Company, Incorporated, New York, N. Y., a corporation of NewYork Application November 14, 1933, Serial No. 691,897 In AustriaDecember 23, 1932 BClaiml.

This invention relates to electromagnetic switching devices and moreparticularly to improvements in reed-type armature mountings forelectromagnetic relays.

It is the object of this invention to improve and simplify thetensioning of relay armatures of the type which are secured to therelaycore through the instrumentality of a reed-type hinge.

A feature of the invention resides in the provision of a means foradjusting the tension of reed mounted armatures which utilizes aparticular form of reed which coacts with a clamping plate for renderingpossible a simplified tensioning of the relay armature.

Another feature of the invention contemplates the cooperation of thereed-type hinge and clamping plate in such a manner that lateralshifting of the armature is rendered impossible.

These and other features of the invention not heretofore specificallyidentified will be readily understood from the following detaileddescription made with reference to the accompanying drawing in whichFig. 1 shows a top plan view of a relay embodying the features of thisinvention; and

Fig. 2 is a side elevation of the relay shown in Fig. 1.

In the following description it is deemed sumcient to refer only tothose parts of the relay structure which particularly relate to thisinvention, it being obvious that the remaining elements of the relay aredisclosed merely to illustrate one application of the invention to awell known type of relay.

The armature 1 is provided with a rounded or arcuate bearing surface atits rear end which surface normally rests upon the surface of the relaycore 5 near its rear end. Secured to the armature 1 by means of rivets,or in any other suitable manner, such as by welding, is a reedtype hinge2 which is, in effect, bifurcated to provide two extending portions. Theextending portions are bent at an angle as they leave the main bodyportion of the hinge and then bent a second time where they meet thecore 5. By means of the angular or inclined portions of the hinge,effected by the two bends, the main body portion is located at a higherlevel than the two extending portions.

A clamp 3 is longitudinally slidably mounted on the rear end of core 5by means of screws 4. The clamp 3 has its two inner comers cut away sothat the transverse edges formed by the cornercuts normally abut againstthe inclined portions of the hinge extensions. The longitudinal edges ofthe corner-cuts serve to offset any tendency the armature may have toshift laterally as such movement is prevented by the engagement of theinner edges of the inclined portion of the hinge extensions with thelongitudinal edges of the 5 clamping plate comer-cuts. The hingeextensions fit between the core and the clamp.

By virtue of the longitudinal slots in the clamp 3 through which thescrews 4 pass, the clamp is free to be moved longitudinally. 10

To increase the tension on the armature it is only necessary to loosenthe screws 4 and move the clamp 3 forward, or in a direction towards thefront end of the relay. This movement tends to'increase the return powerof the armature due 5 to the engagement of the transverse edges of theclamp comer-cuts with the inclined portions of the hinge extensions at apoint higher up on the inclined portions. To decrease the tension on thearmature or to reduce the return power of go the armature, the clampingplate is moved in a direction towards the rear of the relay core.

What is claimed is:

1. A relay comprising a core, an energizing coil thereon, a movablearmature, a reed secured to as one end of said armature for maintaininga predetermined adjustment of said armature with respect to said core,said reed having an inclined portion, and adjustable means engaging theinclined portion of said reed and movable with re- 30 spect thereto andin the direction of the longitudinal axis of said armature for varyingthe adjustment of said armature.

2. A relay having an armature and a core, means for associating saidarmature and core in a certain fixed adjustment, said means comprising areed having one end permanently fixed on said armature and a plate forclamping the other end of said reed to said core, said clamp beingadjustable to vary the adjustment of said armature.

3. In a relay, an armature, a core, a reed having one end secured to oneend of said armature and a. plate for clamping the other end of saidreed on said core, said clamp being adjustable to coact with said reedfor regulating the tension on said armature.

4. A relay having an armature and a core, means for associating saidarmature and core, said means comprising a reed having one endpermanently fixed on said armature and the other end resting on saidcore, said reed having an inclined portion intermediate its ends and aplate for clamping the free end of said reed to said core and engagingthe inclined portion of 1,994,071saidreediormaintainingacertaintensionon 5. A relay comprising a core, acoil mounted on said core, an armature. a reed plate adapted to exert apressurfegon the inclined portion or said reed to tensi said armature,

said plate being movable to engage said reed at various points on theinclined portion thereof to vary the tension on said armature.

6. A relay comprising a core, on said core, an armature, said a coilmounted armature associatedwithsaidcorebymeansoiaflexiblereed and aplate, said reed having one end permanently secured to said armature andhaving extensions clamped to said core by said plate and havingintermediate inclined portions, the front on said armature is variedKURT BLAWlx.

